Adds the region @name to the widget at position @pos in the hierarchy defined in @path. See gtk_style_context_add_region().
Region names must only contain lowercase letters and “-”, starting always with a lowercase letter.
position to modify, -1 for the path head
region name
flags affecting the region
Deprecated: The use of regions is deprecated.
3.0
See Implementation
Adds the region @name to the widget at position @pos in the hierarchy defined in @path. See gtk_style_context_add_region().
Region names must only contain lowercase letters and “-”, starting always with a lowercase letter.